sfb_dump_stats() only runs with RTNL held,
reading fields that can be changed in qdisc fast path.
Add READ_ONCE()/WRITE_ONCE() annotations.
Alternative would be to acquire the qdisc spinlock, but our long-term
goal is to make qdisc dump operations lockless as much as we can.
tc_sfb_xstats fields don't need to be latched atomically,
otherwise this bug would have been caught earlier.
Fixes: edb09eb17e ("net: sched: do not acquire qdisc spinlock in qdisc/class stats dump")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260421141655.3953721-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1ada03fdef